Http types for the fire http crate.
At the moment these types are more suitable
for server implementations than for clients.
## Features
### hyper_body
Adds support for the `hyper::Body` type in `Body`.
### json
Adds json serialization and deserialization support for
the `Body` type and in combination with the feature `encdec`
also to the `HeaderValues`.
### timeout
Adds the `BodyTimeout` type, allowing to set a timeout
for reading from the body.
### encdec
Adds percent encoding and decoding support for the
`HeaderValues` type.